University of Crete HEP Seminars


FP7

Recordings can be found in this link


Toy models for AdS black holes

Speaker: Adam Bzowski
Institution: University of Crete
Time: Tuesday 8 September 2020, 13:00
Venue: 2nd floor seminar room (webinar)
Abstract: I will present two simple toy models exhibiting properties associated with quantum black holes. For the first model I will consider a quantum mechanical system of the double well potential. The second model is obtained by coupling stress tensors of the two CFTs living on the boundaries of the BTZ black hole. The common theme of both systems is that the Hilbert space of states does not admit the usual factorization into a tensor product. Instead, the semi-classical, low-energy physics is emergent and can be reinterpreted in terms of state-dependence.
Recording: The recorded talk can be found here in BBB format and Mp4 format

Introduction to the large charge expansion

Speaker: Domenico Orlando
Institution: University of Torino
Time: Tuesday 15 September 2020, 13:00
Venue: 2nd floor seminar room (webinar)
Abstract: Working in sectors of large global charge leads to important simplifications when studying strongly coupled CFTs. In this talk I will introduce the large-charge expansion via the simple example of the O(2) model and apply it in a number of other situations displaying a richer structure, such as non-Abelian vector models, supersymmetric N=2 systems and asymptotically safe theories.

Quantum codes, lattices, and conformal field theories

Speaker: Anatoly Dymarsky
Institution: University of Kentucky
Time: Tuesday 22 September 2020, 13:00
Venue: 2nd floor seminar room (webinar)
Abstract: There is a deep relation between classical error-correcting codes, Euclidean lattices, and chiral 2d CFTs. We show this relation extends to include quantum codes, Lorentzian lattices, and non-chiral CFTs. The relation to quantum codes provides a simple way to solve modular bootstrap constraints and identify interesting examples of conformal theories. In particular we construct many examples of physically distinct isospectral theories, examples of "would-be" CFT partition function -- non-holomorphic functions satisfying all constraints of the modular bootstrap, yet not associated with any known CFT, and find theory with the maximal spectral gap among all Narain CFTs with the central charge c=4. We also discuss averaging over the ensemble of all CFTs associated with quantum codes, and its possible holographic interpretation. The talk is based on arXiv:2009.01236 and arXiv:2009.01244.

Turbulent hydrodynamics in strongly correlated Kagome materials

Speaker: Ioannis Matthaiakakis
Institution: Julius-Maximilians-Universitaet Wuerzburg
Time: Thursday 24 September 2020, 13:00
Venue: 2nd floor seminar room (webinar)
Abstract: In recent years a lot of interest has been directed towards realizing strongly-coupled electronic fluids. This interest is partly because a stronger coupling enables the transition to the hydrodynamic regime and partly because of the novel transport phenomena such a fluid promises. Strongly-coupled fluids are also a natural and fertile ground for testing and refining our understanding of AdS/CFT and holography in general. In this talk, I will first show that Kagome materials with a relativistic spectrum are a compelling platform for realizing strongly-coupled fluids. Then, I will employ holography to estimate their ratio of shear viscosity to entropy density. With that estimate at hand, I will finally argue that strongly-coupled Kagome fluids put for the first time non-linear hydrodynamic phenomena such as turbulence within experimental reach.

Tidal Trapping of Strings by Microstate Geometries

Speaker: Nicholas Warner
Institution: University of Southern California
Time: Tuesday 29 September 2020, 13:00
Venue: 2nd floor seminar room (webinar)
Abstract: I will describe the fate of a massless (or ultra-relativistic massive) string probe propagating down the BTZ-like throat of a microstate geometry in the D1-D5 system. Far down the throat, the probe encounters large tidal forces that stretch and excite the string. The excitations are limited by the very short transit time through the region of large tidal force, leading to a controlled approximation to tidal stretching. The amount of stretching is proportional to the incident energy, and that it robs the probe of the kinetic energy it would need to travel back up the throat. As a consequence, the probe is effectively trapped far down the throat and, through repeated return passes, scrambles into the ensemble of nearby microstates. This tidal trapping can lead to weak gravitational echoes.

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Speaker: Andreas Stergiou
Institution: Los Alamos
Time: Tuesday 06 October 2020, 17:00
Venue: 2nd floor seminar room (webinar)
Abstract: TBA

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Speaker: Zohar Komargodski
Institution: Simons Center
Time: Tuesday 13 October 2020, 13:00
Venue: 2nd floor seminar room (webinar)
Abstract: TBA

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Speaker: Shai Chester
Institution: Weizmann Institute
Time: Tuesday 20 October 2020, 13:00
Venue: 2nd floor seminar room (webinar)
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Speaker: Ofer Aharony
Institution: Weizmann Institute
Time: Tuesday 27 October 2020, 14:00
Venue: 2nd floor seminar room (webinar)
Abstract: TBA

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Speaker: Lampros Lamprou
Institution: University of British Columbia
Time: Tuesday 03 November 2020, 17:00
Venue: 2nd floor seminar room (webinar)
Abstract: TBA

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Speaker: Alexey Milekhin
Institution: Princeton University
Time: Tuesday 10 November 2020, 17:00
Venue: 2nd floor seminar room (webinar)
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Speaker: Simon Caron Huot
Institution: McGill University
Time: Tuesday 17 November 2020, 16:00 (NOTICE TIME)
Venue: 2nd floor seminar room (webinar)
Abstract: TBA

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Speaker: Stefanos Aretakis
Institution: University of Toronto
Time: Tuesday 24 November 2020, 17:00
Venue: 2nd floor seminar room (webinar)
Abstract: TBA

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Speaker: David Tong
Institution: University of Cambridge
Time: Tuesday 08 December 2020, 13:00
Venue: 2nd floor seminar room (webinar)
Abstract: TBA